Modified exit status of script to prevent build from failing

.circleci/prod-ready.sh

@@ -5,10 +5,12 @@
 # DO NOT edit this file on Windows. It will cause CRLF line endings, which will fail on CircleCI.
 # If you do edit on Windows, use `dos2unix` before you commit.
 
-set -e
-
+# If there is no tag, the script will have non-0 exit code
 GIT_TAG=$(git describe --exact-match --tags HEAD)
-# If there is no tag, this command will fail and the script will automatically exit!
+if [ ! $? -eq 0 ]; then
+  echo "This commit doesn't have a tag, skip setting the version."
+  exit 0
+fi
 
 echo "Found a tag $GIT_TAG"
 VERSION_NUM=$( echo ${GIT_TAG} | cut -c 2- )